Android Tutorial ListView tutorial

Don't use ListView.
Use xCustomListView - it is more powerful, easier to work with and cross platform.

 

[cooperlegend]

How do you use a listview if defined using the designer in a layout ?

 

[Erel]

You will still need to add the items manually.
In the designer you should choose Tools - Generate members and choose the ListView. It will add a declaration for this view under Sub Globals. Note that you should not initialize or add the view to the activity. This is done automatically when you call Activity.LoadLayout.

 

[GeordieJenner]

more complex listview item

unless i am reading this incorrectly, the item seems limiting. i have created a control (or view) with say 10 labels on in, some graphics (like a checkmark for completed), see attached image as ListView Item. is there a way to add a panel to the listview, with a LoadLayout so as to display my view?

 

[klaus]

You cannot add panels to a ListView, but you can do it with a Scrollview.
Have a look here.
And with more details here.

Best regards.

 

[GeordieJenner]

worked perfect, thanks. now, on that 'view' are labels i wish to alter the text. my svload looks like this:
For intX=0 To 12
Dim p As Panel
p.Initialize("")
p.LoadLayout("ctrlAppointmentItem")
svAppointments.Panel.AddView(p,0,intX*61,1080,60)
Next
svAppointments.Panel.Height=13*61
after the dim p, i wish to do something like p.lblName.text = "bob"

suggestions...
btw, i have been using this for about 48 hours and found it incredibly easy to pick up. thanks

 

[GeordieJenner]

actually, kind of got this, just a little help. it appears i have to loop through the view's, but i cannot compare to the label.Name? my test on the label.left worked, but it is not property i wish to compare to.
p.LoadLayout("ctrlAppointmentItem")
For i = 0 To p.NumberOfViews - 1
Dim v As View
Dim l As Label
v = p.GetView(i)
If v Is Label Then
l=v
If l.Left=140 Then
l.Text=intX
End If
End If
Next

 

[kickaha]

The best way to handle this is to use the labels Tag property. Set the tag property of each label to something meaningful, then your code would be

p.LoadLayout("ctrlAppointmentItem")
For i = 0 To p.NumberOfViews - 1
Dim v As View
Dim l As Label
v = p.GetView(i)
If v Is Label Then
l=v
If l.Tag = "intX Label" Then '  "intX Label" used as an example
l.Text=intX
End If
End If
Next

 

[GeordieJenner]

yeah, thought that would be it, the catch-all 'Tag'
thanks

 

[klaus]

If you want to alter the text of the views you could try to replace the Labels by EditText views. I haven't tried it yet but it should work.

Best regards.

 

[GeordieJenner]

interesting, but i there is no IsReadOnly property, so the user could edit it. Is there binding available ItemsSource or DataContext?

 

[klaus]

but i there is no IsReadOnly property

No, but you can set the Enabled parameter to False.

Is there binding available ItemsSource or DataContext?

No.

Bestr regards.

 

[kickaha]

I think the main point is if you are not going to allow the user to edit the text, do NOT use an EditText - a label is a better option from both the coding and the appearance point of view.

 

[GeordieJenner]

But that grey's it out
I will use tag

Thanks for the input

 

[klaus]

Sorry, I probably misunderstood between 'alter the text' and interpreted it as 'edit the text'. The text can be changed (altered) in Labels.
I fully agree with kickaha in using Labels.
The Tag would also have been necessary for EditText views.

Best regards.

 

[GeordieJenner]

thanks for your assistance, and i liked your progress bar example.

 

[Widget]

Background optimization
There is a hidden assumption that the background behind the ListView is solid black. If you set the background to something else like a gradient background or image you will see that during scrolling the background disappears.
You can change the background scrolling color with the ScrollingBackgroundColor property. If the background is not solid color set it to Colors.Transparent.

Example (the activity background is a gradient):

    Dim GD As GradientDrawable
    GD.Initialize("TR_BL", Array As Int(Colors.Gray, Colors.LightGray))
    Activity.Background = GD
    ListView1.ScrollingBackgroundColor = Colors.Transparent

Tips
If you want a single line item with a bitmap (and do not need two lines and a bitmap), you can set the visible property of the second label to false.

I used the code above but I wasn't able to get my ListView1 to be transparent unless I went to the Designer and set Alpha to 0. I thought ListView1.ScrollingBackgroundColor = Colors.Transparent would be the same as setting Alpha to 0.

Is there a difference?

TIA
Widget

 

[Erel]

You should also set ListView1.Color=Colors.Transparent.

 

[Koushik]

Hi,
I am very new to Basic4Android.
I need to create some UI as attached in the screenshot. This is basically to list items with a bitmap and two labels at the bottom similar as Android home screen. The number of items will be determined during runtime.

Please suggest if it is possible using ListView. Otherwise what is the best approach to achieve similar UI as Android home screen.:sign0085:

Regards,
Koushik

 

[Erel]

It will be easier to create this layout with ScrollView. See this link: ScrollView examples summary